Mayo Chiki!

Konoe Subaru, 17, has been serving as the butler of Suzutsuki Kanade in school, a classmate of Sakamachi Kinjirou. Due to an accident, Sakamachi discovers Subaru's secret... that he's actually a girl!? Apparently she will be removed from her position if anyone at school finds out. What will unfold from this chain of events?
According to the cover note of the novel, Asano Hajime's light novel Mayo Chiki! was announced to get an anime adaptation.
Mayo Chiki! is a school love comedy and the winner of the 5th Media Factory Bunko New Author Award. A manga adaptation has been serialized in Monthly Comic Alive since this July.
(All anime info courtesy of ANN and MAL)